In periods of acute emotional stress, the sympathetic nervous - TopicsExpress



          

In periods of acute emotional stress, the sympathetic nervous system combines with the output of the adrenal glands to produce a high level of hormones in the blood. When these hormones reach the heart, they cause it to increase in rate and strength of contraction. It’s one reason why athletes can put that extra effort into a performance, reaching down for extra reserves to carry them to the finish.
Posted on: Tue, 18 Jun 2013 00:37:40 +0000

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